58
ICs
1-1-3 DC/DC Converter ICs
■Lineup
Part Number
Output Voltage (V)
Ch1 Ch2(Select one output)
STA801M 5 9.0 / 11.5 / 12.1 / 15.5
■Absolute Maximum Ratings
Unit
V
W
W
°C
°C
Ratings
43
6.7(With infinite heatsink)
1.6(Without heatsink, stand-alone operation)
+125
–40 to +125
Symbol
VIN
PD1
PD2
Tj
Tstg
Parameter
DC Input Voltage
Power Dissipation
Junction Temperature
Storage Temperature
■Recommended Operating Conditions
Parameter
DC Input Voltage Range
Output Current Range per Channel
Operating Temperature Range
Symbol
VIN
IO
Tjop
Unit
V
A
°C
Ratings
min. max.
Ch2 VOmax.+2 40
0 0.5
–20 +125
■Features
•2 regulators combined in 1 package
• Compact inline package
• Output current (0.5A × 2 outputs)
• Output voltage of Ch2 selectable from 4 levels
• Built-in flywheel diode (Schottky barrier diode)
• Requires only 7 discrete components (2
outputs)
• Internally-adjusted phase corrections and output
voltages
• Built-in reference oscillator (125kHz) - Enables
to downsize a choke-coil due to IC's high
oscillating frequency. (Compared with conven-
tional Sanken devices)
■Electrical Characteristics
(Ta=25°C)
* Efficiency indicates the value when only one channel is active. The value can be calculated as shown below. 7.5mA is deducted for the no-load circuit current of
Icc
at unused
output.
2
η
=
V
O•IO
× 100(%)
V
IN•(IIN–0.0075)
2-Output Separate Excitation Step-down Switching Mode
STA801M
• Built-in overcurrent and thermal protection circuits
• Built-in soft start circuits (Output ON/OFF available)
■Applications
• For BS and CS antenna power supplies
• For stabilization of the secondary stage of switching power supplies
• Electronic equipment
Unit
V
%
mV/°C
mV
mV
V
V
V
V
%
mV/°C
mV
mV
mA
kH
Z
A
Symbol
V
O
1
Conditions
η
1
Conditions
∆V
O
/∆T
a1
∆V
OLINE1
Conditions
∆V
OLOAD1
Conditions
V
O
2-1
Conditions
V
O
2-2
Conditions
V
O
2-3
Conditions
V
O
2-4
Conditions
η
Conditions
∆V
O
/∆T
a
∆V
OLINE
Conditions
∆V
OLOAD
Conditions
I
CC
f
I
S1
Parameter
Output voltage 1
Efficiency *
Temperature Coefficient of Output Voltage
Line Regulation
Load Regulation
Output voltage 2-1
Output voltage 2-2
Output voltage 2-3
Output voltage 2-4
Efficiency*
Temperature Coefficient of Output Voltage
Line Regulation
Load Regulation
No-load Circuit Current
Oscillation Frequency
Overcurrent Protection Starting Current
Ch1
Ch2
(Select one output)
V
O
2-4
Common
Ratings
STA801M
min. typ. max.
4.80 5.00 5.20
V
IN
=20V, I
O
=0.3A
80
V
IN
=20V, I
O
=0.3A
±0.5
30 90
V
IN
=10 to 30V, I
O
=0.3A
10 40
V
IN
=20V, I
O
=0.1 to 0.4A
8.64 9.00 9.36
V
IN
=20V, I
O
=0.3A
11.04 11.50 11.96
V
IN
=20V, I
O
=0.3A
11.62 12.10 12.58
V
IN
=20V, I
O
=0.3A
14.88 15.50 16.12
V
IN
=20V, I
O
=0.3A
89
V
IN
=20V, I
O
=0.3A
±2.0
40 130
V
IN
=20 to 30V, I
O
=0.3A
30 120
V
IN
=20V, I
O
=0.1 to 0.4A
15
125
0.51 0.7
